'Mud Mud Ke Na Dekh' from Shri 420 was an on the spot creation by Shailendra who was teasing Jaikishan

as taken from http://www.hummaa.com/artist/artistdashboard.php?aid=3009

Raj Kapoor introduced Shankar-Jaikishan to the Film world with "Barsaat" (1949). Barsaat was also the first film for the lyricists Shailendra and Hasrat Jaipuri. The team thus formed with Barsaat remained as a unit till the end. Together they gave a number of hits like: Barsaat, Aah, Aawara, Shri 420, Chori-Chori, Boot Polish, Anari, Jis Desh Me Ganga Behti Hai, Main Nashe Me Hoon, Aashiq, Deewana, Ek Dil Sau Afsaane, Sangam, Teesri Kasam and Mera Naam Jokar. Shankar-Jaikishan mainly worked with Shailendra and Hasrat Jaipuri. Apart from the personal preference and proximity related to friendship, this division of work was more in accordance with the composition patterns of the two composers. Shankar always loved composing serious thematic songs witha lot of emotional content that only Shailendra could do justice to, whereas Jaikishan was more into composing light hearted romatntic songs that came so naturally to Hasrat Jaipuri.

The superb chemistry between these four was not merely because they were great artists. It was more because they were all great friends and companions who who enjoyed each other's company to the fullest. So many songs came into being, based on their real life co-experiences. Like 'Mud Mud Ke Na Dekh' from Shri 420 was an on the spot creation by Shailendra who was teasing Jaikishan for looking back repeatedly at a passer by - a beautiful lady, of course! 'Ramaiya Vasta Vaiya' from the same film sparked off when these friends,going on a walk, happened to listen to a folk song sung by some building workers nearby.

Then came the black day of December 13, 1966 when lyricist Shailendra left the material world. With the sad demise of Hasrat Jaipuri the dream team disintegrated. The remaining three members could never really revive the magic of old and their combined work over the next few years was nothing to cheer about. On 12th September 1971, Jaikishan took his final bow from the stage and left the scene forever. Although Shankar still continued to compose under the Shankar-Jaikishan label for many more years, it wasn't even a patch on the vintage S-J stuff. On 26th April 1987, Shankar also bid us final adieu.

Though today, these four great artists are no more with us, their legacy - the superb songs they made together have become an integral part of every music lover's psyche.